/Engine/Source/Developer/HierarchicalLODUtilities/Public/IHierarchicalLODUtilities.h
Cleans any standalone flags for meshes, textures and materials. This ensures that they get garbage collected when not referenced any more.
void CleanStandaloneAssetsInPackage ( [UPackage](API\Runtime\CoreUObject\UObject\UPackage) * InPackage )